Classifying Traffic By Layer 2 Characteristics; Classifying Traffic By Layer 3 Or Layer 4 Characteristics - Avaya P580 User Manual

Multiservice switches

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Classifying Traffic by Layer 2 Characteristics

However, the priority of the 802.1 tag and Cisco ISL tag take precedence

over the priority of the physical port, so the switch uses the priority of the

physical port only if:

No tags are present in the frame

You have set the physical port to ignore priorities in tags.

For information on how to set a port to ignore priorities in tags, see

"Setting a Physical Port to Ignore Tag

* Note: 802.1p packets that are received with a tag priority of 0 on a 50-

series layer 2 (non-routing) module, and that must be routed

via the FORE path on an 80-series supervisor, are queued and

transmitted with a priority of 4. This priority change is due to

the conversion from the high-low priority system that 50-series

modules use to the 8-level priority system that 80-series

modules use.

In addition to Cisco ISL tag, 802.1p tag, and physical port priority, the

switch can classify traffic by:

Source MAC address

Destination MAC address

For information about how to set a priority for a source or destination MAC

address, see

"Setting the Priority of a MAC

In addition to these layer 2 characteristics, you can classify bridged IP

traffic by DiffServ code point. For more information on classifying bridged

IP traffic by DiffServ code point, see "Diffserv" later in this chapter.

You can, alternately, configure the switch to classify traffic by the IP

characteristics of packets, instead of 802.1p tag priority, physical port

priority, or other layer 2 characteristics.

To assign priorities to packets by their IP characteristics, you create a rule in

an access control list (ACL). The rule can:

Set an ACL rule priority

User Guide for the Avaya P580 and P882 Multiservice Switches, v6.0

Priority" later in this chapter.

Address" later in this chapter.